School of Science Department of Physics 60 Quantum Computing Based on NV Center in Diamond Supervisor: YANG Sen / PHYS Student: CHENG Ho Yin / COMP Course: UROP 1100, Spring Quantum computing has emerged as a promising technology that has the potential to change how we process information. Unlike classical computing, which relies on binary bits to store and manipulate data, quantum computing uses quantum bits or qubits that can exist in superposition. This unique property of qubits enables quantum computers to solve certain problems exponentially faster than classical computers, making them particularly useful for tasks such as cryptography, optimization, and simulation. NV centers are point defects in diamond that can be used as qubits due to their long coherence times and ability to be manipulated optically. The goal of the project was to gain a better understanding of how the NV centers respond to 594 nm excitation wavelengths by building the setup for the 594 nm laser. Quantum Computing Based on NV Center in Diamond Supervisor: YANG Sen / PHYS Student: FEI Zijian / PHYS Course: UROP 4100, Fall In this project, we are supposed to use a room temperature experimental setup to detect the charge state of the NV color center. The NV center is a kind of crystal defect in diamond formed by two lattice defects, a nitrogen atom and a vacancy. The NV color center can be in NV0 or NV - states, and NV - is used for quantum calculation. Therefore, in order to improve the quantum fidelity, we need to make a measurement and selection, and select the one only in NV - state. This is done by illuminating it with a 593nm laser and detecting the fluorescence intensity. We need to tune the 593nm laser, use AOM (acousto-optic modulator) to switch the laser on and off, and record the fluorescence count. We also need to optimize the parameters in our work. Quantum Sensing with NV Center in Diamond for Many Body Physics Supervisor: YANG Sen / PHYS Student: BAI Yanze / PHYS-IRE LO Lai Fung Louis / PHYS-IRE Course: UROP 1000, Summer UROP 1000, Summer The NV (Nitrogen-Vacancy) centre is a well-studied diamond defect whose unique optical properties make it a suitable choice for magnetic measurements in extreme environments. In this article, we briefly introduce the working principle of the NV centre, the experimental settings and method to perform the measurement, and the analysis of the obtained data. We will highlight our contributions to constructing and adjusting optical paths, preparing and debugging related devices, and developing data fitting programs. As a series of projects are still in progress, the design and results of specific experiments will be presented in the upcoming articles.
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